carrier-current communication system
71Frequency-hopping spread spectrum — (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver. A spread spectrum transmission offers three main advantages over… …
72Call sign — In broadcasting and radio communications, a call sign (also known as a callsign or call letters, or abbreviated as a call, or otherwise known as a handle) is a unique designation for a transmitting station. In some countries they are used as… …
73Mars Reconnaissance Orbiter — Conceptual image depicting the Mars Reconnaissance Orbiter in an elliptical low planet orbit around Mars Operator NASA / JPL Major contractors Lockheed Ma …
74List of United States Navy aircraft squadrons — This is a list of United States Navy aircraft squadrons. Deactivated or disestablished squadrons are listed in the List of Inactive United States Navy aircraft squadrons. Navy aircraft squadrons are typically composed of several aircraft (from as …
75Frequency mixer — This article is about non linear mixing operating in the frequency domain. For other types of mixers, see electronic mixer. Frequency Mixer Symbol. In electronics a mixer or frequency mixer is a nonlinear electrical circuit that creates new… …
76Digital Audio Broadcasting — For other digital audio broadcasting systems, see Digital radio.   Countries with regular services …
77Color television — Title card for NBC, promoting their broadcast in RCA color . Color television is part of the history of television, the technology of television and practices associated with television s transmission of moving images in color video. In its most… …
78Airship — For other uses, see Airship (disambiguation). Dirigible redirects here. For the 1931 film, see Dirigible (film). Not to be confused with Balloon (aircraft) or Blimp. Airship …
79Telecommunications in North Korea — Communications in North Korea refers to the communication services available in North Korea. North Korea has yet to fully adopt mainstream internet technology due to its isolationist policies.[1] Contents 1 Telephone 1.1 International connection …
80Emerson College — The Shield of Emerson College Motto Bringing Innovation to Communication and the Arts Established 1880 Type …
